When root
turn decimals to fractions
answer is connected to
negative number
must be/could be/cannot be
backsolving
don’t pick an answer that
stands out
root number in denominator
is not permitted
+ and - do not maintain
a ratio
R/3 and S/3 —> then R +- S will be
divisible by 3
If only R or only S is /3 —> then R +- S will be
not divisible by 3
If neither R nor S is /3 —> then R +- S will be
cannot be determined
Sum of consecutive/odd/even/multiple of same number
(first + last/2) x number of elements
Inversed proportion
x1 x y1 = x2 x y2
If a number is made up only of 2 or 5 or their combination the number will be a
terminating decimal